Pump



Dec. 11, 1923. 1,477,300

H. c. THRIFT PUMP Filed May 31. 1921 2 Sheets-Sheet 1 /I N .lz/TOR'.

wwcma,

A TTORNEY.S

Dec, 11, 1923. 1,477,300

H. C. THRIFT PUMP A Filed May 31. 1921 2 Sheets-Sheet 2 i y l l f@ f8.1' E

@e r dynz,

v IN1/ENT f/mq.,

ATTORNEYS Patented Dec. 1l, 1923.

UNITED STATES HOHER C. THRIFT, 0F BURKBURNETT, TEXAS.

PUMP.

Application led May 31, 1921.

To aZZ whom it may concern Be it known that I, HoMER C. THRIFT, a citizen of the United States, residing at Burkburnett, in the county of Wichita and State of Texas, have invented certain new and useful Improvements in a Pump, of which the following is avspecification.

This invention relates to new and useful im rovements in a pump.

(gne object ot the invention is to provide a rotary pump which is so constructed as to develop great pressure and is specially designed for use in connection with a hydraulic jack or other apparatus for the application of power through Huid pressure.

Another object is to provide a pump designed to be used for pumping and delivering fluid and is so designed that it will deliver the fluid in a constant and uniform flow.

A further feature resides in the provision ot' a pump which is of simple construction and may be cheaply and easily manufactured and which will operate with a minimum of vibration and can consequently be readily kept in repair.

lVith the above and other objects in view the invention has particular relation to certain novel features of construction, operation and arrangement of parts, an example of which is given in this specification and illustrated in the accompanying drawings, wherein Figure 1 is a side view of the device partially in section, and

Figure 2 is a vertical sectional view taken on the line 2 2 of Figure 1.

Referring now more particularly to the drawings, the numerals 1, 1 designate the end plates of the casing which are preferably of a circular form and which are spaced apart. Fitted between the margins of the plates is an annular ring 2 to which the plates are bolted, and which encloses the chamber between said plates. A plurality of cylinders 3 are threaded through said ring, eight being shown, and these cylinders radiate from the casing and are spaced, preferably a uniform distance apar-t. lhese cylinders are enclosed by means of cylinder caps 4 which are threaded into the outer ends thereof. Within each cylinder there is the reciprocating hollow piston 5 equipped with the cup ring 6. rThe inner end of each iston has an inlet port 7 and the outer end has an outlet port 8. This last named port Serial N 0. 473,891.

is controlled by an outlet valve 9, which c0- acts with the seat 10 in said piston, and which is confined within the cage 11 and normally held seated by the pressure spring 12. An inlet pipe 13 enters the casing and each cylinder is connected to an outlet manifold 14 from which a suitable outlet pipe leads.

Each piston is connected at its inner end to a U-shaped cross head 15 between the arms of which a roller 16 is mounted to rotate, and surrounding these rollers there 1s an annular band 17 which is confined between the arms of said cross heads. v

Each plate 1 is formed with a central hub 18, said hub being in alignment and these form bearings for the central drive shaft 19. This drive shaft is driven in any suitable manner and splined thereon between said hubs there is the internal eccentric cam 20, surrounding which there is an external eccentric cam 21. The adjoining faces of these cams have overlapping flanges through which lock pins 22 may he passed to secure them together. These cams may thus be adjusted relative to each other to vary the length of the stroke and vary the accordingly.

The ro 1ers 16 are held in constant con-tact with the eccentric cam 21 by means of the band 17, and as the shaft 19 rotates the pistons are reeiprocated back and forth in constant and uniform succession. As the piston moves inwardly the valve 9 is lifted admitting fluid into the cylinder, and as said piston moves outwardly the valve seats and forces the Huid on out into the outlet manifold and thence on through the outlet pipe.

What I claim is 1. A pump including end plates spaced apart, and each formed with a central hub having a bearing, an annular ring seated be tween the margins and the plates to which said plates are bolted forming an inclosed cham er between the plates, a plurality of radiatin cylinders threaded through said ring, cy inder caps threaded onto the outer ends of said cylinders and closing said outer ends, a hollow piston reciprocating in each cylinder, the inner end of each piston having an inlet port, and the outer end thereof having an outlet port, a valve controlling each outlet port, a cage confining each valve, a spring operating against each valve and normally holding the same closed, an inlet pipe entering the casing, an outlet manifold with which each cylinder is connected, an

pressure outlet pipe leading from said manifold, a U-shaped cross head connected to the inner end of each piston, a roller bearing be; tween the arms of each cross head, an annular band surrounding said rollers and confined between said arms, a driving shaft rotatabl mounted in said hub bearings, and a cam slsiaped member fixed on said shaft between said hubs, with the periphery of which said rollers are in contact.

2. A pump incuding end plates spaced apart and each formed with a central hub having a bearing, an annular ring seated between the margins and the plates to which said plates are bolted forming an inclosed chamber between the plates, a plurality of radiating cylinders threaded through said ring, cylinder caps threaded onto the outer ends of said cylinders and closing said outer ends, a hollow piston reciprocating in each cylinder, the inner end of each piston having an inlet port, and the outer end thereof having an outlet port, a valve controling each outlet port, a cage conning each valve, a spring operating against each valve and normally holding the same closed, an inlet pipe entering the casing, an outlet manifold with which each cylinder is connected, an outlet pipe leading from said manifold, a U-shaped cross head connected to the inner end of eachpiston, a roller bearing between the arms o each cross head, an annulaiband surrounding said ro'lers and confined between said arms, a driving shaft rotatably mounted in said hub bearings, and a cam sha ed member fixed on said shaft between sai hubs, with the periphery oit' which said rollers are in contact, said cam shaped member including an internal eccentric cam, an external eccentric cam surrounding said internal cam, the adjacent faces of said cams having overlapping flanges and lock pins .passing through said ianges to secure said cams together, and to permit their adjustment relative -to each other.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

' HOMER C. THRIFT.

Witnesses:

R. M. SMITH, WM. A. CATHEY. 

